Fbans t



(No Model.)

' P. T.'STROBEOK.

THROAT PLATE FOR SEWING MACHINES. v No. 356,510. Patented Jan. 25, 1887.

WITNESSES: NVENLIOR N, PETERS, Pmwum n mr, Washinglomb. c.

ATENT rmcn.

FRANS T. STRCBECK, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, OF NEXV JERSEY.

TH ROAT-PLATE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 356,510, dated January 25,1887.

Application filed June 4, 1886. Serial No. 204,151. (No model.)

To all whom, it may concern.-

Be it known that I, FRANS T. SrRoBEcK, a citizen of the United States, residing'at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Throat Plates for SewiugMaehines, of which the following is a specification, reference being had therein to the accompanying drawings.

Sewing machine throat-plates heretofore used in connection with that class of cutting or trimming attachments the cutting-knives of which have small guiding-fingers and forward of said fingers chisels or cutting-edges have usually been provided with apertures down into which the said fingers and the cutting-knives extended, the edges of the said apertures adjacent to the said cuttingknives cooperating with the latter in severing the material. \Vhen, however, the edges of the aperture in a throat-plate become-worn,the knife could not out well, and it then became necessary to supply a new throat-plate.

The object of my invention is to provide a throat-plate of such construction that the portions thereof adjacent to the cutting-knife may,when worn, be removed and replaced by new portions without necessitating a new throat-plate, my construction also permitting the trimming to be done at different distances from the line of sewing without changing the throat-plate.

To this end I provide my throat-plate with a removable bar in which the needle hole or throat is made, a recessed portion of said bar forming the side wall of the aperture, against which the edge of the cutting-knife works. Secured to the throat-plate is a second bar or plate, the end of which forms the other side .of the knife-aperture, said plate being adjustable lengthwise, so that its end may be moved from or toward the needle-hole. walls of the knife-aperture become worn, the plate may be adjusted to compensate for such wear, or the plate and throat-bar may be removed from the throat-plate and new ones substituted therefor without changing the throat-plate. To vary the width .of the gage or the distance between the line of cutting and the stitches, the plate may be adjusted toward \Vhen the or from the needle-hole and a throat-bar having a recess of greater or lesser depth substituted for the bar formerly used.

In the drawings, Figure 1 is a plan view of a throat-plate embodying my invention. Fig. 2 is a plan view of the same with the removable plate and throat-bar detached. Fig. 3 is an edge View of the throat-plate; and Figs-{I and 5 are detail views of the throat-bar and adjustable plate, respectively.

A denotes the throat-plate,having the usual feed-opening, a, and also an opening, b, for the passage of the needle and cutting-knife. Fitting in a longitudinal recess, a, in the plate A is the bar (I, which is removably secured to said plate by screws 6, said bar having a needle hole or throat, f, and a knife-recess, g. The plate A is also provided with a transverse slot or recess, h, in which is secured, by a screw, i, passing through a slot, j, an adjustable bar or plate, 7:, the inner. end of which extends into the recess 9, and between which end and the adjacent portion of the throatbar (Z the cutting-knife works. The platekis provided atits inner end with a notch, m, for the reception of the guiding-finger of the cuttingknife.

From the foregoing it will be apparent that the plate 70 may be adjusted toward the bar (I to compensate for wear, and that the distance of the cutting from the line of the stitches may be varied, within narrow limits, by providing interchangeable throat-bars having knife-recesses of varyin g'depths, and'adj usting the plate It toward or from the needle-holef, according to the depth of the kniferecess in the bar in use.

When the edges of the bars (1 and plate k, against which the knife works, become worn, the said bar and plate may be removed from 9 the throat-plate and new ones substituted.

Having thus described my invention,Iclaim and desire to secure by Letters Patent 1. The combination, witha sewing-machine throat-plate, of a th roat-bar removably secured thereto and an adjustable plate secured to said throat-plate at right angles to said bar, substantially as set forth.

2. The combination, with a sewing-machine throat-plate having longitudinal and trans 100 verse recesses, of a throat-bar removably seremovably secured to the said throat-plate cured in said longitudinal recess and provided and provided with the recess or notch m, subatone side with a kniferecess and an adjustable stantiall y as set forth. plate removably secured in said transverse In testimony whereof I aflix my signaturein recess, with its end projecting into the said presence of two Witnesses. i knife-recess, substantially as set forth. T n ,1 7 1 r 3. The CO]11bil]21lJiO11,Wil3h the throat-plate A, FRAAS SlROBELIX' of the bar (1, removably secured thereto and XVitnesses: provided with the needle hole or throat f and T. M. OoNrRors'r, 1o knife-recess g, and the adjustable plate 7:, also V. It. PEIROE. 

